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Proceedings
of the National Academy of Sciences (PNAS)

Proceedings of the
National Academy of Sciences is a multidisciplinary journal that
covers the biological, physical, and social sciences. It is printed
weekly and publishes new content online each business day. Ranked
by the Institute for Scientific Information as one of the world's
most-cited scientific serials, PNAS Online receives more than 1
million hits each week. http://www.pnas.org/